Core drill



March 20, 1928. v 1,663,096

* J. T. PHIPPS CORE DRILL Filed March 11, 1925 2 Sheets-Sheet 1 (Za T1,663,096 J. T. PHIPPS CORE DRILL 6 Filed March 11, 1925 2 Sheets-Sheet2 Mr h 20, 1928.

| l I I 1 I I l I l l l v l '16 l I J65 w J56 Patented Mar. 20. 1928.

UNITE s'r Te JOHN T. PHIIPIS, OF H'ONTINGTON PARK, CALIFORNIA, ASSIGN'OBTO E C. SMITH MANUFACTURING COMPANY, OF WHIT'IIER, CALIFORNIA, ACORPORATION OF" CALIFORNIA.

' CORE DRILL.

Application filed March 11, 1925. Serial No. 14,688.

I This invention relates to core drills for taking cores of formationsto be drilled for oil, water and other wells, which cores are taken sothat the log of the well may accurately' reflect the formations throughwhich the well is produced. The invention has for its object to providean improved core drill which, together with the core-receiving tube, mayreadily be assembled with or applied to a, tubular drill stem and its-collar, and the parts and features of which a are so constructedgformedand applied that substitution of fresh parts orv dressed drill membersmay readily be made, and the core- 1 receiving tube with its core mayreadily be removed from the drill stem for removal of the core. I Theinvent-ion has for further objects the provision of an improvedcore'drill construction and organization which will be superior in pointof simplicity and inexpensiveness, takexrtogether with durability,facility in use,- adjustment, replacement, repair and dressing of thecutting portions, and positiveness, efiiciency and speed in use andoperation. e. a 7 'With the above and other objects in view,

the invention consists in the novel and useful provision, formation,construction, combination, association and relative arrange ment ofparts, members and features, all as ereina'fter described, shown in thedrawing and finally pointed out in claims. In the drawin s:

Figure 1 is a ragmentary tional side elevation of a drill stem andcorerceiving .tube assembled, with core drill features constructed andorganized to embody the inyvention in one form; I Figure. 2 is anenlarged bottom plan view of the drill shown in Fig. 1. v Figure 3 is averticaltransverse sectional view taken upon the line 3.3, Fig. 2;

Figure 4 is asimilar view taken upon the line 4..4,'Fig l Figure 5 isan'enlarged side elevation of the lower portion of the constructionshown in Figure 1; V

Fi ure 6-is a perspective view of a core f tube ushing shown inthe otherfigures;

and partly sec-' 10, said cutters each Figure 7 is a perspective view ofa core breaker shown in the other views;

Figure 8 is a bottom plan view of a core cutter shown in the otherfigures; and,

Figure 9 is a side elevation ofsuch core cutter as shown, in Figure 8.

Figures 2 to 9 inclusive are drawn to the same scale. 1

Corresponding parts in all the figures are designated by the samereference characters. Referring particularl' to the drawings, I haveshown at A a dril stem provided with a male member a of a taperedthreaded tool joint, whereby such drill stem maybe connected with astring of drill tools or'drill tubing. a I

This tubulardrill stem is provided at the lower end with a drill collar10, preferably produced by enlarging the drill tube, and

this jdr-ill collar is vertically slotted, there being preferably three.such slots formed, as

at 11, for the initial rece tion of anannular bushing 12 provided Wlth aplurality of radial external heads or bosses 13 respectively receivedbyand within the slots '11, so that the bushing 12 fits] up within thedrill collar 10, and, being shouldered as at 13 and. threaded internallyabove such shoulder, as at 13", receives in threaded union the lowerendportion of the core tube B, which is first passed upwardly. within thedrill stem, prior to introduction of the bushing 12, as mentioned. Thecore breaker C" is annular in form and rovided with a lurality ofinwardly an upwardly inclined core breaking teeth14, which may beproducedby punching the metal ofthe annulus C inwardly, and this annulusor breaker rin G is positioned within the drill collar 10 be neath thebushing 12 and brought into position to abut against the same, suchbreaker annulus being of slightly larger internal di-. ameter than theinternal diameter of the lower-portion of the bushing 12, which lowerportion is slightly diminished to produce a downwardly tapering bore forthe retention of the core at its lower end.

The cutters D are then inserted upwardly into the lower portion of thetubing collar having a segmental body 00 a transverse cutting edgeportion 16" at its lower extremity extending to the inner periphery ofthe body 15. Dovetail heads. 16

are held in dovetail recesses 16 in the collar 10, at abuttin ends ofthe segmental bodies 15, firmly ho din-g the cutters D in place. Thelower edge of each such cutter sectlon is provided with a plurality ofcutting teeth having transverse cutting edges 16 which are arranged in aseries in the arc of a circle having the same generating center as thearc in which lie the cutting edges 16", the largest are described "bythe cutting edges 16 having a lesser radius than the are described bthe'outer cutting portions of the edge16. 'Rhese cutting edges 16 thusconstitute lower terminal portions of the segment 15. All

of the cutting edges 16"v and 16 lie in the same plane transversely ofthe segment 15.

, The drill stem is provided with a circular passage 17, preferablycoaxial with the .drill' stem A, and -in the upper portion thereof, andextending through the joint member a whereby fluidmay'be circulated downthrough the drill stem and outwardly throughlongitudinal circulationpassages 18 at the lower end of the drill collar 10, to provide fluidfor the cutters D.

The heads or bosses 13 upon the bushing 12 are provided each with a ventpassage 13 communicating with the interior of the bushing 12, and theinterspace between it and the core tube B and the core itself, whichlatter is indicated at E. At the'top of the core tube B isa ventcontrolled by a ball check valve 19 within a cage 20, which is normallyseated, but may be unseated by air pressure within the core tube, topermit air displacement upon the introduction of the core within thetube, or displacement of water or any other medium therein. This checkvalve, however, serves to prevent flooding of the core tube withthefluid supplied through the circulation passage 17 If, however, the tubebecomes so flooded, the vents 13 discharge such fluid matter from thetube. These vents likewise permitdisplacement of air or other media fromthe core tube upon theintroduce tion of the core, making entrance of thecore with the tube easier; and in case the check valve 19 becomesclogged or obstructed drainage of the tube may take place through suchvents.

, There are a pluralit of the cutter segments D employed, an they,together-with the collar 10, breaker annulus C andthe bushing 12 areheld inplace in the following manner: The cutter sections 15 areinternally enlarged to produce shoulders 15. upon breaker annulus C hasan opening 21 through.

which headed bolts 22, one at a time, may be passed, the shanks of suchbolts being passed "through bores "or perforations 23 n the drill collar10, and the heads being received within chambers or pockets 24 in therespective adjacent cutter sections 15. Nuts 25 are applied to the outerthreaded ends of the bolts 23, externally of the drill collar 10. I

The method of use and operation of a core drill mechanism or deviceconstructed and organized to practice the invention will be readilyunderstood from the foregoing description, taken in connection with theaccompanying drawings. However, it may be added that when theparts areassembled, as shown in Figures 1, 2, 3, 4 and 5, the drill stemisoperated through the drill string from the mouth of the bore, and thecutting edge portions or teeth 16 and 16" enter the earth formation andproduce a bore of a diameter greater than that of the enlarged drillcollar 10, inasmuch as the heads 16 upon the cutters'or cutter segments15 ex- .tend radially outwardly of the periphery of the ,drill collar10. As the earth formation is cut away and thecuttings or detritus ormud is removed by the circulation system including the bore 17, thedrill stem A and the passages 18, so that'the spoil from the bore passesout at the surface of the bore of the drill string, the core is producedwithin the field of the'a'ction of the cutting edges of the cuttersegments. This core progressively produced in this manner passesupwardly within the cutters, the core breaker, the bushing 12 and thecore tube; and, when it is desired to withdraw the core, pulling of thedrill string or tubing causes thebreaker larly in the starting of thecoring action, r

the core being engaged by the teeth 14 in the rotation of the drill stemand cutters.

and turning with the teeth, the annulus of the core breaker thus turningwithin the'cutter segments, and, with said teeth, holding the core awayllfrom the cutters, and out of anymaterial frictional contact with thein ner face of the bushing 12., The enlarged lower portion of thebushing provides an internal core, chamber within the tube B having aninner diameter greater than the diameter of the core, so that nomaterial friction of the core in engagement with the inner walls of thecore tube occurs. The cutters D, with breaker and bushing 12 may readilybe removed from the drill stem and drill tube, freeing the core.

It is obvious thatvarious and extensive changes and modifications inconstruction, formatiom'adaptation, assemblage and combination andassociation of parts, members and features may be made, and indulged in,in variation and distinction from the foregoing description andstatement, and the disclosure of the accompanying drawings, in adaptingthe improvements to'varying conditions of use and service, withoutdeparting from the true spirit of the invention.

; Having thus disclosed my invention, I

claim and desire to secure by Letters Patout:

1. Improvements of the character disclosed, comprising a tubular drillbody, and a core tube within the same, means being provided forretaining the core tube against I end.

vertical movement within the'drill body and in driving relation theretoand removable at the bottom thereof, said means comprising a detachablemember applied within the bottom of the drill body, saiddetachablemember having a vent communicating with the interior of the 'core tubeand leading to the exterior of the drill bodyabove its lower 2Improvements of the character disclosed, comprising a tubulardrillrbody, and

a core tube within the same, means being provided for retaining the coretube against vertical movement within the drill body and in drivingtelation thereto and removable at the bottom thereof, said meanscomprising a detachable member applied within the bottom of the drillbody, said detachable mem- ',--ber having a vent communicating with theinterior of the core tube and leading to the exterior ofthe drill bodyabove its lower endysaid core tube having a valve opening at the upperend thereof.

3. Improvements of* the character dis,-

closed, comprising a'tubulardrill body, and

acore tube within the same, means being provided for retaining the coretube against vertical movement within the'drill body and in drivingrelation thereto and removable at the bottom thereof, said meanscomprising a detachable member applied within the bottom of the drillbody, said detachable member having a vent communicating with theinterior of the core tube and leading to the exterior of the drill bodyabove its lower end, said drill body havinga circulation pas- .sage atthe upper end portion thereof.

' 4. Improvements of the character disclosed, comprising a tubular drillbody, and a core tube within the same, means being provided forretaining the core tube against vertical movement within the drill bodyand exterior of the drill body above its lower end, said core tubehaving a valve opening at the upper end thereof, said drill body havinga circulation passage. at the upper end portion thereof.

5. In improvements of the character disclosed, a. tubular drill body, acore tube within the drill body, and a bushing within the drill bodybelow said tube and connecting the lower end of the core tube with thedrill body, said bushipg being provided with a laterallydisposed ventcommunicating with the interior of said bushing and leading; to theexterior thereof above its lower en v 1 6. In improvements of thecharacter disclosed,a tubular drill body, a core tube within the drillbody, and a bushing within the drill body and beneath the core tube,said drill body being slotted at its lower portion between the interiorand exterior thereof,

and said bushing being provided with radial extens ons received withinsaid slots.

7 In improvements of the character disclosed, a tubular drill body, acore tube within the drill body, and a bushing within the v drill bodyand beneath the c'ore tube, said drill body being slotted at its lowerportion between the interior and exterior thereof, and said bushingbeing provided with radial extensions received within said slots, meansbeing provided for holding said bushing detachably'in position. v

8. In improvements of the character disclosed, a tubular drill body, acore tube withv in the drill body, and a bushing Within the drill bodyand beneath the core tube, said drill body being slotted at its lowerportion, and said bushing being provided with radial extensions receivedWithin said slots, vents being formed in said radial extensions.

9.- In improvements of the-character disclosed, a tubular drill body, acore tube within the drill body, a bushing within the drill bodyconnecting the lower end of the core tube to the drill body, and a corebreaker within the drill body beneath the bushing. I

mentioned features detachably in assem- I blage. 1

11. 'In' improvements of the character disclosed, a tubular drill body,a core tube with in the drill body, a bushing Within the drill bodyconnecting the lower end of the core within the drill body beneath thebushing, a J

tube to the drill body, and a core breaker able in assemblage.

12. In improvements of the character disclosed, a tubular drill body, acore tube within the drill body, a cutter having an. upper portionextending axially into the drill body and sup orting the core tube inrigid relation with said drill body, and a core breaker supported by thecutter beneath the core tube.

13. In improvements of the character disclosed, a tubular drill body, acore tube .within the drill body, and a cylindrical cutter.

adapted to. be inserted upwardly within the drill body to support; thecore tube and provided with external radial projections'extendedupwardly within slots in the lower end portion of the drill body andextending between the interior and exterior of said body. I v I 14. Inimprovements of the character disclosed, a tubular drill body, a coretube with in the drill --b0dy, and a cylindrical cutter comprisingsegmental sections adapted to be inserted upwardly within the drill bodyto support the core tube and provided with external radial projectionsextended upwardly within slots in the lower end portion "5 of the drillbody, there being a bushing Within the drill body and with which'thelower end of the core tube .is' detachably-connected, said bushinghaving radial projections likewise entered within said slots.

15. In improvements of the character dis closed, a tubular drill body, acore tube within the drill. body, and a cutter segment adapted to beinserted within the drill body beneath the core tube and provided withexternal radial projections 1 received within slots in the lowerendportion of the drill body, there being a bushing withinthe drillbody. with which the lower end of the core tube is detachablyconnected,'said bushing having radial projections likewise enteredwithin said slots, said radial projections'having vents leading to theinterior of the core tube.

16. In improvements of the character dis-- closed, a drill body having acentral bore and an arcuate cutter body fitting within the 'bore of saiddrill body and provided with a radial extension extended outwardlywithin a slot in the lower portionof thedr'ill body, said radialextension being formed at its lower extremity into a cutting edge.

17. In a core drill the combination of; a

tubular drill body having axial openings in the wall thereof extendingup a short dis-.

tance from the lower end ofsaid body; a

core tube adapted to be extended upwardly tubular drill body into saidbody; a bushing secured to the openings and be secured therein to retainsaid bushing in place.

- 18. In a core drill the combination of: a

tubular drill body having axial openings in" the wall thereof extendin"up. a short distance fromthe loweryen of said body; a core tube adaptedto be extended upwardly into said body; a bushing secured to the lowerend of said core tube; projections pro-' vided upon said bushing whichare received by said openings when said core tube is insertedin saidbody, said projections having vents formed therein which communicatebetween the lower end of a core chamber, formed within said core barreland said bushing and the exterior of said drill body; and cutting meanssecured to the. lower end of said body in such manner as to hold saidbushing in place.

19. In a core drill the combination of: a tubular drill body havingaxial openings in the wall thereof extending up a short. dis tance fromthe lower end of said body and from the inner to the outer surfaces ofsaid.

body; a core tube adapted, to be extended upwardly into said body; abushing secured to the lower end of said core tube; projections providedu received by sai openings when said core tube is inserted in said body;and a cutter on said bushing which are tubular 'drill body having axialopenings in the-wall thereof extending up a short dis- ,tancc from thelower end of said body and from the inner to the outer surfaces of said(body; a core tube; adapted to be. extended upwardly into said body; tothe lower end of said tions provided upon said a bushing secured coretube; pro ecbushing which are received by said openings when saidcoretube is inserted in said body. said projections having vents formedtherein which communicate between the lower end of a core chamber formedwithin said core barrel-and said bushing and the exterior of said drillbody; and cutting means-secured'to the lower end of said body insuchmanner I to hold said bushing in place. 21. In acore-drillthecombination of: 'a

the wall thereof tance fromthelower end of said body and from the innerto the outer surfaces of said body; a core tube adapted to be extendedhaving axial openings in extending up a .short disupwardly into saidbody; a bushing secured 'to the lower end of said coretube; projectionsprovided upon said bushing which are received by said openings when saidcore tube is inserted in said body; a cutter member adapted to beinserted upwardly into the lower end of said body; projections formedupon said cutter member which are received by said body openings beneathsaid bushing between the interior and exterior thereof; a

core tube adapted to be extended upwardly into said body; a bushingsecured ,to the lower end of said core tube; projections provided uponsaid bushing which are received by said openings when said core tube isin-- serted in said body; a cutter member adapted to be insertedupwardly into the lower end of said body; projections formed upon saidcutter member which are receive said body openings beneath saitl bushmgprojections; means member in place in said drill body, there be ing acore breaker recess formed in said outter member; and a core breakeradapted to be retained in said recess.

23. In a core drill the combination of: a

tubular drill body having axial openings in the wall thereof extendingup a short'distance from the lower end of said body; a core tube adaptedto be extended upwardly into said body ;"a bushing secured to the lowerend of said 'core tube projections provided upon said bushing which arereceived by said openings when said .core tube is lnserted in sald body;an-annular cutter member formed of arcuate sections abutting" together,abutting faces of sald sectlons having openings; and studs adapted to beinserted in said openings whensaid' cutter member is d'sposed upwardlyin the lower end of said I-lll body, and engage the wall. of said bodyto retain said core tube, bushing and cutter member in assembly withsaid tubular drill body. 1 j

24. In a core drill the combination of: a tubular drill body havingaxial openings in the wall thereof extending up a short distance fromthe lower end of said body and between the interior and exteriorthereof; a core tube adapted to be extended upwardly into said body; abushing secured'to the lower end of said core tube; projections providedupon said bushing which are received by said openings when said coretube is inserted in said body; a cutter member adapted to be insertedupwardly into the lower end of said body; pro'ections formed upon saidcutter member -wh1ch are received for holdinglsaid easier by said bodyopenings beneath said bushing projections, said cutter projectionsforming the major cutting teeth of said core drill; and means forholding said cutter member in place in saicbdrill' body.

25. In a core drill the combination of a tubular drill body having axialopenings in the wall thereof extending up a short distance from. thelower end of said body; a core tube adapted to be extended upwardly intosaid body; a bushing secured to the lower, end of said core tube;projections pro vided upon said bushing Which are received by saidopening when said core tube is in-- serted in said body; an annularcutter member adapted to be inserted upwardly inthe lower end of saiddrill body so as to hold said bushing in place, said cuttermemb'erhaving sectors so formed as to provide securmg open ngs at thepoints of their meeting; minor cutting teeth provided upon 7 the loweredges of said sectors; majorcut ting teeth extending from said sectorsso as to fit into said axial drill body openings; and means for securingsaid cutter member in said drill body, said means extendinginto saidsecuring-openings.

26. In a core drill the combination of: a tubular drill body havingaxial openings in the wall thereof extending up a short distance fromthe lower end ofsaid body; a core tube adaptedto be extended upwardlyinto said body; a bushing secured to the lower end. of said core tube;projections pr vided upon said bushing which are received by saidopenings when said core tube is inserted in said body; an annular cuttermember formed of arcuate sections abutting together, abutting faces ofsaid sections having openings; studs adapted-to be inserted in saidopenings when said-cutter member a core breaker adapted to be retainedin said recess.

27. In a core drill the combinationof: a tubular drlll body having axialopenings in the wall thereof extending up a short distance from thelower end of said body; a

core tube adapted to be extended upwardly into said body; a bushingsecuredto'the lower end of said core tube; projections provided uponsaid bushing which are re ceived by said openings when said core tube isinserted in said body; an annular cutter member adapted to beinserted'upwardly in the lower end of said drill body so as to hold saidbushing in place, said cutter memher having sectors so formed as toprovide securing openlngs at the points of their n1eeting;minor cuttingteeth provided upon breaker recess formed in said Cuttermemthe loweredges of said sectors; major out her; and a core breaker adapted to bereting teeth extending from said sectors so as tained in said recess. 1to fit into said axial drill body openings; In testimony whereof, I havesigned my 5 means for securing said cutter member in name to thisspecification.

said drill body, said means extending into saidsecuring openings, therebeing a core JOHN T. PHIPPS.

